forEach嵌套循环的问题

程序中：

List firstList =
    for(int i=; i<firstList.size(); i++) {
        List secondListList =
        request.setAttribute("option" + i, secondList);
    }
request.setAttribute("first", firstList);  

页面中：

<%int i=; %>
<c:forEach items="${first }" var="list">
    ${list.title }
    <c:forEach items="${_____ }" var="olist">
    <%i++; %>
    ${olist.optioni }</span>
    </c:forEach>
</c:forEach>  

请问我内层循环的items="${__________ }"该怎么填？

<%
        List<String> list = new ArrayList<String>();
        list.add("a");
        list.add("b");
        list.add("c");
 
        List<String> member = new ArrayList<String>();
        member.add("hello");
        member.add("world");
 
        request.setAttribute("list", list);
 
        for(int i = ; i < list.size(); i++) {
            request.setAttribute("option" + i, member);
        }
 
    %>
 
    <c:forEach items="${requestScope.list}" varStatus="status" var="item">
        ${item}的选项
        <c:set value="${'option'}${status.index}" var="option" />
        <c:forEach items="${requestScope[option]}" var="i">
            ${i}
        </c:forEach>
 
        <br>
    </c:forEach>